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Vulnerability Alert

Cisco IOS XR Software Memory Exhaustion Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:30978
Version:1
First Published:2013 October 02 16:11 GMT
Last Published:2013 October 02 16:11 GMT
Port: Not available
CVE:CVE-2013-5503
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:Cisco IOS XR Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the UDP process of Cisco IOS XR Software version 4.3.1 could allow an unauthenticated, remote attacker to cause the UDP process to consume all available packet memory.

The vulnerability is due to the failure of the device to release memory of allocated UDP packets when the packet queues are full. An attacker could exploit this vulnerability by potentially sending traffic to listening UDP services on the affected device. An exploit could allow the attacker to cause the device to exhaust all available memory, causing the device to be unable to allocate memory for packets sent to it.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco IOS XE Software version 4.3.1 is affected.
 
IntelliShield Analysis
To exploit the vulnerability, an attacker must send packets to the targeted device. If access control lists prevent the device from accepting packets from untrusted systems, attackers may be unable to exploit the vulnerability.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCue69413 at the following link: cisco-sa-20131002-iosxr 
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause the device to exhaust all available memory, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper memory operations when processing UDP packets. The affected software fails to release consumed memory.

An unauthenticated, remote attacker could exploit this vulnerability by sending a series of packets to the targeted device. The vulnerability is triggered with packets sent directly to the destination device. Transit packets on the device do not cause a vulnerable condition. The processing of a series of UDP packets could cause the packet memory to be depleted, causing the device to be unable to allocate memory for packets sent to it. As a result, the device may consume all available memory resources, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.

The Cisco Applied Security Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Cisco IOS XR Software Memory Exhaustion Vulnerability 
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
4002/0UDP Host FloodS5722011 Jun 07 
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco IOS XR Software 4.3 .1

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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